Ecommerce KPIs That Actually Matter (and the Ones That Don't)

Most ecommerce dashboards have too many numbers, not too few. The problem isn't tracking — it's that forty metrics crowd out the five that actually drive decisions.

Here's the filter: a KPI matters if a change in it changes what you do. By that test, these earn their place — each paired with the decision it drives.

Customer Acquisition Cost (CAC), by channel

The decision it drives: where to put your ad budget. If Meta acquires at $32 and Google at $58, you know where the next dollar goes. CAC without a channel breakdown is nearly useless — the average hides the answer.

Customer Lifetime Value (LTV)

The decision it drives: how much you can afford to spend acquiring a customer. A $40 CAC is reckless if customers are worth $60 and healthy if they're worth $300. LTV tells you whether your CAC is a problem or a bargain.

Conversion rate by traffic source

The decision it drives: where to fix leaks and where to double down. A blended rate hides everything. Segmented, it tells you email converts at 6% while paid social converts at 0.9% — which is where your money's leaking.

Contribution margin by product

The decision it drives: what to promote and what to cut. Revenue by product tells you what sells; margin by product tells you what makes money. Often not the same product — and promoting the wrong one costs you on every sale.

Repeat purchase rate

The decision it drives: whether to invest in acquisition or retention. If customers rarely return, more ad spend fills a leaking bucket. If they do, retention compounds. This ratio tells you which game you're playing.

What to leave off

Impressions, follower counts, raw pageviews, email open rates — metrics that feel like progress because they go up easily but rarely tell you what to do. Not wrong to glance at; wrong to build decisions around.

The discipline

For every metric on your dashboard, ask "if this changes, do I know what to do?" Keep the ones with a clear answer. Cut the rest. A dashboard of five decision-driving numbers beats one with forty that mostly decorate.